Re: [PATCH 00/23] per device dirty throttling -v8

[Ingo Molnar <mingo@elte.hu>]

* Diego Calleja <diegocg@gmail.com> wrote:

> El Sat, 4 Aug 2007 18:37:33 +0200, Ingo Molnar <mingo@elte.hu> escribió:
> 
> > thousands of applications. So for most file workloads we give 
> > Windows a 20%-30% performance edge, for almost nothing. (for 
> > RAM-starved kernel builds the performance difference between atime 
> > and noatime+nodiratime setups is more on the order of 40%)
> 
> Just curious - do you have numbers with relatime?

nope. Stupid question, i just tried it and got this:

 EXT3-fs: Unrecognized mount option "relatime" or missing value

i've got util-linux-2.13-0.46.fc6 and 2.6.22 on that box, shouldnt that 
be recent enough? As far as i can see it from the kernel-side code, this 
works on the general VFS level and hence should be supported by ext3 
already.

even relatime means one extra write IO after a file has been created, 
but at least for read-mostly files it avoids the continuous atime 
update.

	Ingo
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